Absolute rotary encoder P**58
Appendix
Subject to reasonable modifications due to technical advances. Copyright Pepperl+Fuchs, Printed in Germany
Pepperl+Fuchs Group • Tel.: Germany +49 621 776-0 • USA +1 330 4253555 • Singapore +65 67799091 • Internet http://www.pepperl-fuchs.com
Date of issue 01/15/04
44
9.3 Terms
Term Meaning
Address A number that is assigned to each bus station regardless of whether
it is a master or slave. For a rotary encoder, it can be adjusted in the
connection hood with decimal rotary switches and is retained in
memory even when the power is turned off.
Baud rate The speed of a data transfer; indicates then number of bits
transferred per second (baud rate = bit rate).
Bus station A device that is capable of sending, receiving or amplifying data via
the bus.
Configuration During configuration, the master specifies properties of the slave,
for example the number of input and output words.
(→ DDLM_Set_Prm).
DDLM Direct Data Link Mapper. The interface between PROFIBUS DP
functions and the encoder software.
DDLM_Data_Exchange The operating status of the bus in which "normal" data traffic occurs.
DDLM_Set_Prm The operating status of the bus in which configuration data is
transferred.
DDLM_Slave_Diag The operating status of the bus in which diagnostic data is
requested by the slave (for example rotary encoder).
Diagnostics Detection, pinpointing, classification, display and further evaluation
of faults, malfunctions and messages.
DP Local peripherals
Encoder Alternative designation for absolute rotary encoder
Freeze A master command to the slave. The master is thus able to freeze
the states of the inputs to the current value. Input data is not
updated again until after the UNFREEZE command is sent.
GSD file Device master data file (in german: Geräte-Stammdaten-Datei). A
file in which slave-specific properties are specified. The GSD is a file
that is made available by the manufacturer for most PROFIBUS
stations. The formats of the GSD are specified in a uniform manner,
thus facilitating access to them by the corresponding control
software. (→ type file).
Master A bus station that is able to send data "of its own initiative". It also
determines which slave should send data at any given time. (→
Slave)
Octet, Byte A data unit of 8 bits = 1 byte
Parameter assignment Transfer of specific parameters (in this case, for example resolution
per revolution, direction of rotation, etc.) from the master to the slave
(in this case the rotary encoder).
Parameter assignment is performed when the system starts up.
PROFIBUS Process Fieldbus, a european fieldbus standard specified in the
PROFIBUS standard. It assigns functional electrical and mechanical
properties to a bit-serial fieldbus system.
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